Small pocket advise?

[Matthew Hajicek - Singularity]

I'm cutting 17-4 H900 on a VF-3SS with 15KRPM.  The feature I'm struggling with is a pocket .232" square by .130" deep, with .020" corner radii and a .050" long by .040" wide notch sticking out one side.

 

 

I've been piloting the corners and the tip of the notch with a .0394" drill, drilling the center to .1693", roughing the pocket with a .118" bull with .010" radius leaving .001" per side, then trying to finish with a .035" x .187" w/ .005 Rad 3-flute Harvey 53635-C6.  It's this last tool that I'm using about a cutter per part.

 

My best try so far is at 15KRPM, 4.05IPM, contour ramp with a .0047" ramp depth.  I've also tried peel milling but with worse results.

 

I have checked runout and it was well under .0001".

 

Any advise would be appreciated, thanks.

 

[duckdogers]

is edm an option

[Matthew Hajicek - Singularity]

Nope.

[Chris_C]

Waterline , then finish the floor with a Horizontal...

[Matthew Hajicek - Singularity]

I'm going to try plunging the leftover before the finish pass.

 

Hey Chris, you're right next door!  What's your company?

[Chris_C]

 

Hey Chris, you're right next door!  What's your company?

Brookdale Plastics....We're right off of 169 & Plymouth Rd 

[Matthew Hajicek - Singularity]

Cool, you're nine minutes away.  I'm at 169 and 694.

[Chris_C]

Sweet ! Though depending on the time of day , it could be more like an hour away...

 

Did you work at ProtoTek a while ago?  I seem to remember you coming out to my old job , and help me configure V8...Back in 99' or 2000'

[Matthew Hajicek - Singularity]

Yup, 2000 and '01.

[Mr. M]

Possibly try conventional milling it instead of climb

[Rstewart]

^^^^^

 

 

You'll need a rough, semi-finish, and a finish tool.  Leave .0002 or .0003" and conventional mill the last couple tenths.

[Chris_C]

^^^^^^^^^^

 

Finish mill .0002" in a Hass....  

[Matthew Hajicek - Singularity]

I finally got it working reliably.  Like Rstewart said, I added a .062" EM for an intermediate pass; that seemed to make the difference.